Conclusion

For the modest financial outlay, the new Sigma 19mm f/2.8 EX DN lens is definitely worth considering, especially for Sony E-Mount users looking for an affordable wide-angle lens. It's less attractive for Micro Four Thirds owners, though, with smaller rivals from Panasonic and Olympus available that deliver better image quality, although the Sigma offering undercuts them all in terms of value. It may not be the smallest, fastest focusing or best-performing compact system camera lens, but it does hit an attractive price-point without having to make too many compromises.